Looking for the GM OEM part # Just gm replacement #
Thank you for the info you supplyed
Most aftermarket muffler, may say 3" inlet, but neck down in side as much 2 1/2 "
Need to get info on OEM Muffler. As stated by Walker Exhaust
The 1990–93 Chevrolet 454 SS pickup What factory muffler did it have ? Part # Size ? in and out. Not the intire system , just a oem replacement muffler.